private void card_OnContentCardOffscreen(ContentCardBase card)
 {
     if (OnContentCardOffscreen != null)
     {
         OnContentCardOffscreen(card);
     }
 }
 public void removeContentCard(ContentCardBase card)
 {
     parentCanvas.Children.Remove(card);
 }
 public void removeRegionOverlay(ContentCardBase card)
 {
     if (card is ContentCardRegion)
     {
         //Card offscreen is region, get rid of the region
         removeRegionOverlay(((ContentCardRegion)card).getExplorerRegion());
     };
 }